how to find decay factor

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Question:Find the percent of decrease for each decay factor for the following examples
1) 0.92
2) 0.65
3) 0.04
4) 0.995
5) 0.73
6) 0.18
7) 0.65
8) 0.025
Use a table to graph each function
1) y=18*0.98^x
2) y=36* (1/3)^x
Please help me, i have been searching the internet for help, i forgot my text book in class and cant afford to lose points for not handing in my homework, all help will be appreciated<3

Question:Complete the table for the radioactive isotope. (Round to 2 decimal places.)
Isotope 226Ra
Half-life (Years) 1599
Initial Quantity _____
Amount after 1000 years .40 grams
The answer is .62 grams, I just need to know how to get there. Thanks!
Oh, and by the way, in 226Ra the 226 is supposed to be superscript (at least I think that's the word).

Question:Plutonium is red-hot as it decays and apparently gives off a lot of heat. However, I cannot find a temperature. Is the temperature always a certain level or is it hotter at first, then cooling off as it decays?

Answers:Plutonium 238 is the isotope used to fuel spacecraft. It has a half life of about 88 years meaning that if you have 1 gram of it now, in 88 years you will have 1/2 gram of it. The heat is used to power a thermocouple and that makes electricity.
Thess links are pretty good reading:
http://www.epa.gov/radiation/radionuclides/plutonium.htm
http://www.lanl.gov/source/orgs/nmt/nmtdo/AQarchive/05spring/heart.html
http://www.uic.com.au/nip18.htm
Remember, heat and temperature are too different things. The environment where the stuff is kept would determine the temperature. How much of it you have would determine the amount of heat it outputs. I would surmise that over a period of 88 years, the heat output would be 1/2 of what it originally was.

Question:how do you find factors of large numbers which will be the sum or difference of another number?
Example:
what are the factors of 4860 when added together will be the sum of -63?
I mean, how would you know where to start cuz the number is large. If i would do trial and error with numbers it takes a really long time.
Please help.

Answers:if the number is even then its divisible by 2. if the sum of the num is divisible by 3, then the num is divisible by 3. if the last two digits of a number is divisible by 4, then the num is divisible by 4, if the num ends in 0 or 5 its divisible by 5 and so on...

From Youtube

Time lapse of a dead pig decaying, part 2 :During the run of the CSI exhibit at the Science Museum of Minnesota (www.smm.org the Science Buzz team decided to dig deeper into the science behind forensic entomology...or how bugs are used to help solve crimes. So what does this have to do with a decaying pig? Pigs are a lot like people in some ways. With similar organs, muscles and bones, all beneath mostly hairless skin, pigs make reasonable substitutes for human bodies. They have been used as military and medical test subjects for generations, and now they are playing an important part in the scientific study of what happens to us after we die. Knowing when a pig died, scientists will gather data on the stages of its decay. Criminal investigators can then use this information to reveal a time and place of death when they find a human body in similar condition. Our pig, which you see here, came from a local farmer and died a natural death. We let it rot behind the museum and captured several images every minute to create this time-lapse video of its decay. What observations can you make about the pig's decay? You can learn more about this pig and the science of forensic entomology over at Science Buzz (www.smm.org

How to Find the Greatest Common Factor :Expand the description and view the text of the steps for this how-to video. Check out Howcast for other do-it-yourself videos from stevenkittinger and more videos in the Mathematics Tests category. You can contribute too! Create your own DIY guide at www.howcast.com or produce your own Howcast spots with the Howcast Filmmakers Program at www.howcast.com The methods for finding the greatest common factor for a series of numbers and for an algebraic expression are similar. To complete this How-To you will need: A series of numbers Algebraic expressions Step 1: Determine for a series of numbers Factor each number in a series of numbers completely into its primes; identify the common factors for each number; and then multiply the common factors together. Tip: A prime number is a positive integer that is not itself the product of two smaller positive integers. Step 2: Use 18 and 27 Use the numbers 18 and 27 as an example. The primes of 18 are three, three, and two. The primes of 27 are three, three, and three. So the greatest common factor is three times three, or nine. Step 3: Determine the greatest common factor for algebraic expressions Identify all of the common factors in a series of algebraic expressions. Step 4: factor 60x2y and 210xy2 Use the expressions the common factors of the first expression are two, two, three, five, x, x, and y. The common factors in the second expression are two, three, five, seven, x, y, and y. So the greatest common factor is two times three ...